﻿using System;
using System.Collections.Generic;
using System.Text;

namespace CochinitaCorte//.CochinitaCorteData
{
	using System.Runtime.InteropServices;

	internal class RawPrinterHelper
	{
		// Structure and API declarions:
		[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
		public class DOCINFOA
		{
			[MarshalAs(UnmanagedType.LPStr)]
			public string pDocName;
			[MarshalAs(UnmanagedType.LPStr)]
			public string pOutputFile;
			[MarshalAs(UnmanagedType.LPStr)]
			public string pDataType;
		}
		[DllImport("winspool.Drv", EntryPoint = "OpenPrinterA", SetLastError = true, CharSet = CharSet.Ansi, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
		public static extern bool OpenPrinter([MarshalAs(UnmanagedType.LPStr)] string szPrinter, out IntPtr hPrinter, IntPtr pd);

		[DllImport("winspool.Drv", EntryPoint = "ClosePrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
		public static extern bool ClosePrinter(IntPtr hPrinter);

		[DllImport("winspool.Drv", EntryPoint = "StartDocPrinterA", SetLastError = true, CharSet = CharSet.Ansi, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
		public static extern bool StartDocPrinter(IntPtr hPrinter, Int32 level, [In, MarshalAs(UnmanagedType.LPStruct)] DOCINFOA di);

		[DllImport("winspool.Drv", EntryPoint = "EndDocPrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
		public static extern bool EndDocPrinter(IntPtr hPrinter);

		[DllImport("winspool.Drv", EntryPoint = "StartPagePrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
		public static extern bool StartPagePrinter(IntPtr hPrinter);

		[DllImport("winspool.Drv", EntryPoint = "EndPagePrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
		public static extern bool EndPagePrinter(IntPtr hPrinter);

		[DllImport("winspool.Drv", EntryPoint = "WritePrinter", SetLastError = true, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
		public static extern bool WritePrinter(IntPtr hPrinter, IntPtr pBytes, Int32 dwCount, out Int32 dwWritten);

		// SendBytesToPrinter()
		// When the function is given a printer name and an unmanaged array
		// of bytes, the function sends those bytes to the print queue.
		// Returns true on success, false on failure.
		public static bool SendBytesToPrinter(string szPrinterName, IntPtr pBytes, Int32 dwCount)
		{
			Int32 dwError = 0, dwWritten = 0;
			IntPtr hPrinter = new IntPtr(0);
			DOCINFOA di = new DOCINFOA();
			bool bSuccess = false; // Assume failure unless you specifically succeed.

			di.pDocName = "Sistemas Profesionales - Corte";
			di.pDataType = "RAW";

			// Open the printer.
			if (OpenPrinter(szPrinterName.Normalize(), out hPrinter, IntPtr.Zero))
			{
				// Start a document.
				if (StartDocPrinter(hPrinter, 1, di))
				{
					// Start a page.
					if (StartPagePrinter(hPrinter))
					{
						// Write your bytes.
						bSuccess = WritePrinter(hPrinter, pBytes, dwCount, out dwWritten);
						EndPagePrinter(hPrinter);
					}
					EndDocPrinter(hPrinter);
				}
				ClosePrinter(hPrinter);
			}
			// If you did not succeed, GetLastError may give more information
			// about why not.
			if (bSuccess == false)
			{
				dwError = Marshal.GetLastWin32Error();
			}
			return bSuccess;
		}

		public static bool SendStringToPrinter(string szPrinterName, string szString)
		{
			IntPtr pBytes;
			Int32 dwCount;
			// How many characters are in the string?
			dwCount = szString.Length;
			// Assume that the printer is expecting ANSI text, and then convert
			// the string to ANSI text.
			pBytes = Marshal.StringToCoTaskMemAnsi(szString);
			// Send the converted ANSI string to the printer.
			SendBytesToPrinter(szPrinterName, pBytes, dwCount);
			Marshal.FreeCoTaskMem(pBytes);
			return true;
		}
	}
}
